Income Taxes (Reconciliation of the Federal Statutory and Effective Income Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income before income tax provision	$ 56,850	$ 14,258
Statutory taxes at 21.0%	11,939	2,994
State and local income taxes	1,890	(626)
Non-deductible expenses	725	426
Percentage depletion	(6,245)	(3,744)
R&D and other federal credits	(363)	(367)
Settlements and uncertain tax positions	166	6,286
Coronavirus Aid, Relief, and Economic Security ("CARES") Act - carryback rate differential	0	(4,741)
Other, net	613	(763)
Income tax provision	$ 8,725	$ (535)
Effective income tax rate	15.30%	(3.80%)